Liquid screen for industrial purposes



E. HONEYMAN LIQUID SCREEN FOR INDUSTRIAL PURPOSES June 29 1926.1,590,688

Filed'Dec. 10 192 2 Sheets-Sheet 1 June 29 1926,

E. HONEYMAN LIQUID SCREEN FOR INDUSTRIAL PURPOSES Filed Dec.

10 1924 2 Sheets-Sheet 2 III Patented June 29, 1926,.

UNITED STATES I 1,590,688 PATENT QFFICE.

EPHRAIM HONEYMAN, or MILWAUKEE, Wisconsin, ASSIGNOR no onnm nnr'rCOMPANY, OFVMILWAUKEE, WISCONSIN, A oonronarron or wrsoonsriv;

LIQUID SCREEN FOR INDUSTRIAL PURPOSES.

Application filed December 10, 1924.

My invention relates to liquid screens such as are used for removing thecoarser material that may be carried by liquids to be used in industrialpurposes. As the use of such screens has become more common the tendencyhas been to increase the size of the screening or filtering units, andthis in turn has imposed upon the screen much heavier duty in that theloads of material picked up by the screen and removed from the liquidare increasingly large and heavy. One of the prime requisites of aliquid screen. of this character isthat there shall .be as few openspaces as possible between the successive screening units and bet-weenthese units and the stationary parts of the apparatus past which thescreen units move; and that the screening surface of each unit shall beobstructed or 'cut' off as little as possible by the supports employedto unite the screen units in series and to move them.

My invention has for its object to secure both of these desirablefeatures in a very perfect manner and to otherwise improve-the screen. VI

In the accompanying drawings Figure 1 is a. bottom plan view of asection of a screen formed of perforated sheet metal units embodying myinvention.

Fig. 2 is a longitudinal sectional view taken on the line 11-11 of Fig.1.

Fig. 8 is a transverse sectional View on the line III-III of Fig. 1.

Fig. 4 is a, longitudinal 7 similar to Fig. 2 illustrating the inventionapplied to a screen, the screening surfaces of the units of which areformed of woven wire material.

The screen that I illustrate consists of a series of screening units orsections A supported by a pair of parallel endless chains B, which serveto unite and impart motion to them. The screen sections illustrated inFigs. 1 to 3, and designated A, are formed of sheet metal punched as maybe desired to form the screen surfaces, while those shown in Fig.hdesignated A, are formed. of stiff woven wire fabric. .For mostpurposes these two forms of liquid screens are the equivalents of eachother.

The screen sections are secured to the opposite chains B, in a mannerthat will be described, and are brought together end to end as closelyas is practicable for good working conditions, in order to reduce to asectional view unit.

Serial No. 755,108.*

minimum the openspaces between them. It is well understood that thechains B work in connection with supporting and driving wheels, usuallysprocket wheels the teethof which enter the open. spaces between theside bars of the links of the chains, and that around these wheels theendless moving screen passes. As the screen surface flexes in passing asupporting wheel thetendency is for the screen sections A; toseparate'at their adjacent ends, and-considerable diliic-ulty has beenexperienced in the use of screens of this character by reason of thisfact, various means having been employed to prevent or check the flow ofunscreened liquid through the openings thus formed, as

.the endless screen makes itslower turn in the liquid in which it issubmerged. I have largely overcome this difliculty by causing the screensect-ions to overlap at their adjacent ends, the end of one. sectionbeing curved, as indicated at 2, on an arc the center of which is the.oint of articulation uniting the screen whose end is thus curved withthe next adjacent one. Thiscauses the screen end 2 to extend below andbeyond. the edge,

3, of the adjacent screen, and it is entirely.

practicable to bring these two parts very close together so the openspace between them is small. The are of curvature of the part 2 is suchthat the flexing of the screen, while moving the curved portion 2 of onescreen section relative to the edge 3 of the next screen section, doesnot open a joint between these sections, the curved portion being ofsuflicientlength to insure that its edge 4 never passes the edge 3,while the screen is making a turn.

The end of the screen section, either A or A, that is opposite thecurved end 2, is bent upward and at an acute angleflto the flat mainscreening surface, 6, of the section, forming a lip, 5, that serves asthelifting basket with which the screening sections or units areordinarily provided in screens of this character. The edge 3 of thesection overlying the-curved portion 2 of the adjacent section, is atthe apex of the angle formed by the portions 5 and 6 of the screen Thelip, 5, forming the basket may be strengthened by a reinforcing strip,7, if this be found desirable, and I prefer this arrangement when. wovenwire is used to of the screen.

tween the lip and the main floor or body,

'of a screensection. They are formed of c side bars, 9, 9, connected bypins, 10, on

which may be mounted anti-friction rollers, 11. The side bars, 9, are ofconsiderable depth so that the fiat screening surfaces, 6,

of the screen units lie a considerable distance above a plane'passingthrough the axes of the connecting pins, 10, when the screen is laidhorizontally, as indicated in 2. The side bars of the chain links areeach cut away near one end, as indicated at 12, and into the open spacesthus formed the curved ends 2 of the screen sections extend.

The screen units extend across and beyond 7 the chainsB atboth sides ofthe screen and the fiat portions, 6, thereof rest directly upon theupper edges of the side bars of the links. Supporting these units neartheir opposite ends are transverse bars, 13, which are connected withthe side bars of the links by angles, 14, the upper edges ofthe crossbars being preferably in the same plane as the edges of the links towhich they are connected. The cross bars, are bolted or riveted totheangles and the latter are connected with the chains preferably by boltsand nuts, 15, The transverse bar, 13, at one end of a chain link restsagainst'the vertical faces orshoulders, 16, of the cut away portions ofthe side bars of the link, and at the opposite end the bar rests againstthe verti- It willbe 9 making a very rigid carrier element for thescreen, and constituting good supports for the'separate units of thelatter, which'are united to the transverse supporting bars by securingdevices of any suitable character as indicated at 19. The. bars, 13, mayex tend quite to the edges of the screens, or they may terminate alittle insidelof said edges as may be found desirable, but in any eventthey serve to support the screen sections, near theiropposite ends,practically the entire distance'from sideto side. The screen sectionsrest directly upon-the edges of the side bars of the chains and of thetransverse bars, 13, and these are so narrow that they obstruct' butlittle the screening surfaces.

The longitudinal sides of the screen sections are preferably imperforatefor a short distance back from each edge to strengthen the screensections, as indicated at 18. This 5 I secure by not perforating thesheet of which the section is formed, asin the sections or unitsdesignated A, or by attaching separate strips, when the screen sectionis made of woven wire fabric. I

It 'willhe seen that'the side bars'of the links of the chains B arerelatively deep, so

that the screening surfaces, 6, which are supported upon the upper edgesof said bars, are a suilicient distance from the plane in which areincluded the joints of articulation of the chain, when the latter is inan extended, straight condition, to allow the extended curved portions 2of the screen units to extend into the open spaces formed by the outaway'portions 12 of theside bars. These side bars, as .well as thetransverse supporting bars 13, are thin, and being disposed verticallythey offer but little obstruction to the screening surfaces 6. At thesame time, the arrangement shown, the transverse bars at the forwardends of the links resting against the vertical ends of the side bars ofthe links and the cross bars at the rear cnds'of the links restingagainst the vertical shoulders 16 of the links, makes a very rigid andstrong articulatedsupport for the screening units.

7 What I claim is:

' 1. In 7 an articulated liquid screen, the combination of a pair ofchains the links of Which are formed of relatively deep, separated,sidebars united by connecting pins, the side bars being cut away ontheir upper edges near one end of each link, screen units each supportedby the corresponding links of the opposite chains, the

said units restingdirectly' upon the upper edges of theside bars ofopposite links, and one end of each unit being curved and extended so asto be overlapped by the end of the next'adja'cent link, the said curvedends of the screen units lying in thespaces formed by cutting away theside bars of the links,'the overlapping portions of the screen unitscoming closetogether and the curvedportions being shapedto permitarticulation of the screenf'units without openiing joints between them y2. In an articulated .liquid screen, the combination of a pair of chainsthe links of which are formed of relatively'deep, separated sidebarsunited by connecting pins, the side bars being cut away on their uppersides near one end of each link, screen units each supported by thecorresponding links of the'opposite chains and resting directly upon theupper edges thereof, one end of each unit being curved and extended soas to lie in the spaces formed by cutting away the side bars of thelinks next adjacent to those'to which the units are respectivelyseterial collected by the screens, the lastsaid ends of the screen unitsoverlapping the curved portions of the adjacent screen units and beingbrought close thereto, the said curved portions being shaped to permitarticulation of the screen units without opening joints between them.

3. In a liquid screen, the combination of articulated, opposite chains,screen units carried by the corresponding links of the opposite chains,the rear ends of the screen units being bent at an acute angle to thefiat screening surface to constitute lifting baskets, and braces forholding the baskets in shape.

4. In an articulated liquid screen, the combination of a pair ofparallel chains each formed of separated, vertically disposed relativelydeep thin side bars which are cut away on their upper edges near one endof each bar, screen units carried by the corresponding links of theopposite chains, resting directly upon the upper edges of the side barsof the chains, and vertically disposed thin transverse bars united tothe chain links for supporting the screen units near their ends, thetransverse bars being located in the spaces formed where the side barsare cut away and resting against vertically disposed faces of the sidebars so the upper edges of the transverse bars are in the same plane asare the upper edges of the side bars of the chains the screen unitsresting directly upon the upper edges of the said transverse bars.

5. The combination stated in claim 4, having the transverse bars and thescreen units they support extended beyond the outer side bars of thechains.

EPHRAIM HONEYMAN.

